Nut-lock.



J. R. STEELE.

NUT LOCK.

APPLICATION FILED JUNE 9,1917- 1 ,262,99 1 Patented Apr. 16, 1918.

51 r Mvem oz B'OZBERT STEELE, OF 080, NEW YO:v

NUT-LOCK.

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Specification of Letters Patent.

Patented Apr. 1%,1918.

Application filed. June a, 1917. Serial no. 173,758.

To all whom it may concern:

Be it known that 1, JAMES ROBERT S'rnmm, a citizen of the United States,and a resident of Owego, in the county of Tioga and State of New York,have invented a new and useful Nut-Lock, of which the following is aspecification.

The invention is an improved nut-lock, suited especially for track-work,in which the locking is effected by the interaction of two nuts, and theobject is to secure an effective, positive look without the aid ofspecial locking devices and one which is unaffected by stretching of thebolt.

In the accompanying drawings:

Figure 1 may be termed a side view of the device, the first nut beingscrewed up againstthe base and the second nut being separated at adistance from the first;

Fig. 2 is a view looking at the high point of the first nut, the secondnut being here shown as forced up tight; and

Fig. 3 is a view loolnng at the inclined face of one of the nuts.

Upon the bolt 1 are placed two rigid nuts 2 and 3, both angular, andpreferably,

though not necessarily, square. The nut 2 has preferably a normal faceat the side next the base 4. Its opposite face 5, however, is slightlyinclined, and it is important to note that the slope extends from one ofthe angles or corners as the point of greatest prominence. This isindicated in Fig. 3 by the arrows, representing the direction of s ope,face corner a being the point of greatest prominence. The second nut 3has its inner face 7 similarly formed a being its high point. Both thesloping faces' are plane.

The nut 2 is first screwed tight against the base. Then nut 3 is screwedup. The nuts touch first at one of the high corners, with elsewhere agap between them of varying proportions. Continued forcible turning ofthe outer nut produces a canting of this nut upon the bolt, and ifcarried far enough will finally close the (gap between the nuts,bringing the bevele a which the outer nut can be turned no'farthe cesflat together, after ther. After the first contact, as the high point aapproaches the high point a, resistance is encolmtered, canting theouter nut as described, and when the high point has passed, theresistance is less to forward turning but will increase if the bolt beturned backward. If the high point a is carried around again theresistance as it a second time approaches the Point a is still greaterand the resistance to unscrewing after it has passed is correspondinglygreat. .This resistance effectively prevents loosening of the nuts byvibration.

It is to be understood that more or less looseness exists between thethreads of ordinary bolts and nuts, and the first effect of the cantingof the outer nut is accordingly to tilt the threads of the nut 11 on thethreads of the bolt so that they bin Further forcing of the nut throwsthe parts in tension and may slightly deflect the bolt; but theconstruction is such as to avoid destroying the threads or exceedin theelastic limit of the metal, permanent istortion of the threads orbending of the bolt being undesired.

From the foregoin it will be perceived that in my nut-lock tliere isanelastic locking-by of two high corners, which in all cases positivelyprevents loosening of either nut by vibration. In no instance can thenuts be tightened and left in such relation that unscrewing is opposedonly by frictional resistance.

What I claim as new is:

A nut-lock comprising two angular nuts on a bolt, said nuts being formedwith plane opposed surfaces having direct contact with each other, eachof said surfaces being inclined and sloping from an exterior corner asthe point of greatest prominence, whereby the outer nut when screwedforcibly against the inner nut produces a canting and an elasticlocking-byof the two high corners constituting a, positive lock againstunscrewmg.

JAMES ROBERT STEELE.

